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1 National Agricultural Research Foundation, Institute of Kalamata, Lakonikis 87, 24100 Kalamata, Greece
2 Agricultural University of Athens, Department of Agricultural Biotechnology, Electron Microscopy Laboratory, Iera Odos 75, 11855 Athens, Greece
Correspondence
Georgios I. Zervakis
zervakis{at}kal.forthnet.gr
A novel, Gram-negative, non-motile, non-sporulating, rod-shaped bacterium isolated from a viscous two-phase olive-oil mill waste (‘alpeorujo’) is described. The strain, designated AW-6T, is an obligate aerobe, forming irregular, pigmented creamy white colonies. The pH and temperature ranges for growth were pH 5–8 and 5–45 °C, with optimal pH and temperature for growth of pH 6–7 and 28–32 °C, respectively. Strain AW-6T was chemo-organotrophic and utilized mostly D(+)-glucose, protocatechuate and D(+)-xylose, followed by L-cysteine, D(–)-fructose, D(+)-galactose, L-histidine, lactose, sorbitol and sucrose. Menaquinone-7 was detected in the respiratory chain of strain AW-6T. The major fatty acids of strain AW-6T were C16 : 1
7c and/or iso-C15 : 0 2-OH, iso-C15 : 0, iso-C17 : 0 3-OH and C16 : 0. The closest phylogenetic relative of strain AW-6T was clone BIti35 (89.7 % 16S rRNA gene sequence similarity), while Sphingobacterium thalpophilum DSM 11723T was the closest recognized relative within the Sphingobacteriaceae (88.2 % similarity). Strain AW-6T showed a low level of DNA–DNA relatedness to S. thalpophilum DSM 11723T (33.8–37.0 %). The DNA G+C content of strain AW-6T was 45.6 mol%. Physiological and chemotaxonomic data further confirmed the distinctiveness of strain AW-6T from members of the genera Sphingobacterium and Pedobacter. Thus, strain AW-6T is considered to represent a novel species of a new genus within the family Sphingobacteriaceae, for which the name Olivibacter sitiensis gen. nov., sp. nov. is proposed. The type strain is AW-6T (=DSM 17696T=CECT 7133T).
The GenBank/EMBL/DDBJ accession number for the 16S rRNA gene sequence of strain AW-6T is DQ421387.
An electron micrograph showing the cell morphology of strain AW-6T and a dendrogram based on data for 40 physiological and chemotaxonomic characteristics of strain AW-6T, members of the genera Sphingobacterium and Pedobacter and Flavobacterium mizutaii are available as supplementary material in IJSEM Online.
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